I purchased a threaded adapter from the local hardware it had a 10-32 thread in it I drilled a hole in the thick part of the lower receiver threaded in the adapter with a allen wrench and used POR15 epoxy putty to lock it all together.I have used that putty on a Bennelli M1Super 90 to shorten the length of pull . I used that particular threaded adapter because I had a ACE Stock from another project and used the sling swivel from it pictures are posted on camouflaging the MP22. I am waiting on the paint to fully cure and I am going to epoxy the swivel to the adapter with some Permatex general clear epoxy. I called S&W to put the new MagPul adapter in it and they told me they were not doing that so I decided to do my own.